228 results about "Polymer melt" patented technology

The present application discloses a continuous dynamic and efficient devolatilization method for a polymer / volatile system based on high mass transfer interfaces, including the following steps: providing a dynamic single-screw devolatilizer, feeding a polymer solution to the devolatilizer, wherein the polymer solution includes polymer and volatile substances with small molecule weight, and the volatile substances include organic solvents, residual monomers, water or reaction by-products; conveying and compressing polymer materials by the screw downstream a devolatilization section, and extruding the polymer materials out of the dynamic single-screw devolatilizer directly; or providing a side-feeding extruder downstream of the devolatilization section and feeding plastic additives into a devolatilized polymer melt, and then melt blending the plastic additives with the devolatilized polymer melt at an end of the dynamic single-screw devolatilizer before exiting the dynamic single-screw devolatilizer.

The invention discloses a synchronous temperature control method for co-extrusion molding of a multilayer polymer film, and relates to the technical field of high polymer material processing, and the method comprises the following steps: setting a target temperature interval of each polymer layer of the multilayer polymer film, and according to the melting characteristics, heat sensitivity and interface bonding requirements of each layer of material, setting a target temperature interval of each polymer layer of the multilayer polymer film; respectively determining an extrusion temperature set value and an allowable fluctuation range; through layered independent temperature control and preheating matching, thermal behavior synchronization of multiple polymer melts is achieved, and the interface bonding stability is improved; through a die head heat insulation and buffer structure, interlayer heat interference is effectively shielded, and the integrity of a functional layer is guaranteed; through the intelligent closed-loop temperature control system, the state of each temperature control area is predicted and adjusted in real time, and self-adaptive optimization of thermal control is achieved. And the co-extrusion quality, the consistency and the production intelligent level of the multi-layer film are integrally improved.

The invention discloses a novel textile material with eiderdown wrapped by rainbow yarn nanofibers and a preparation method. The novel textile material comprises skeleton fibers located at the axis, an eiderdown component with a heat preservation effect and a rainbow yarn nanofiber reinforcing layer wrapping the outer surface of the eiderdown component. The wrapping reinforcing layer is of a three-dimensional network structure formed by continuous or quasi-continuous nanofibers in a winding, interweaving and lap joint mode, so that stable compounding and structural shaping of down feather components and skeleton fibers are achieved under the condition that the down feather components and the skeleton fibers do not depend on adhesive fixation. The preparation method comprises the following steps: cleaning, drying and opening down for pretreatment; performing melt differential electrostatic spinning on the polymer melt under a high-voltage electrostatic field to form rainbow yarn nanofibers; the down flocs are introduced into the coating area through the framework fibers, so that the rainbow yarn nanofibers are deposited and wound to form a coating reinforcing layer; after being gathered and shaped and twisted into yarns, the yarns can be continuously dragged and wound. The novel textile material has spinnability, structural stability and long-acting thermal insulation performance, and is suitable for spinning, weaving and knitting processing.

The invention discloses a supercritical fluid assisted polymer devolatilization distributor. The supercritical fluid assisted polymer devolatilization distributor comprises a gradually-shrinking channel, a throttling channel and a gradually-expanding channel which are connected in sequence. A static mixer is arranged in the throttling channel, the upstream pressure is maintained to be above a supercritical state by increasing fluid resistance, meanwhile, the mixing effect of supercritical fluid and polymer melt is enhanced, stable and uniform foam flow is formed, and pressure fluctuation is avoided; an automatic pressure relief valve assembly is arranged on the upper portion of the divergent channel and composed of a valve opening, a valve cover plate, a spring, an adjusting knob and the like, when the system pressure exceeds a set value, exhaust is automatically started, and controllable pressure relief is achieved. A plurality of rows of flow distribution holes are formed in the lower part of the distributor to ensure that the melt uniformly flows out to form stable melt strips; the problems that traditional equipment is difficult to pressurize and not timely in pressure relief are solved, the supercritical state maintenance, gas-liquid separation and melt forming processes are optimized, the volatile component removal efficiency is improved, the phenomenon that melt strips are broken or accumulated is effectively prevented, and continuous and stable operation of the devolatilization process is guaranteed.

The invention belongs to the field of polymeric high-molecular polymer production equipment, and relates to a final polycondensation reactor for preparing a high-quality and high-viscosity PA66 polymer, the final polycondensation reactor comprises a shell and a stirring device located in the shell, and the shell is provided with a feed port, a discharge port and a gas phase port; the shell comprises an inner layer and an outer layer, and an area between the inner layer and the outer layer forms a jacket layer; the inner layer of the shell is composed of a cylinder I and a cylinder II, and the diameter of the cylinder I is larger than that of the cylinder II. One bottom surface of the cylinder I and one bottom surface of the cylinder II are intersected and overlapped areas are communicated with each other; the position of the feed port is higher than that of the discharge port; the stirring device consists of a transmission shaft and a stirrer; the first stirrer consists of a disc and a spiral belt fixed on the disc; the second stirrer comprises a spiral structural member; and the third stirrer comprises a spiral propeller. According to the invention, the continuous propulsion of the polymer melt in the final polycondensation process is realized, the backmixing of the high-viscosity polymer melt is prevented, and the retention time consistency of the polymer melt is improved.

A method for molding a magnetic material into a rotor stack, including providing a polymer melt including magnetic compound particles and a polymer binder, providing a rotor including a plurality of cavities, the rotor being arranged in a mold having a mold cavity surface, and providing a gap between the outer periphery of the rotor and the mold cavity surface. The method also includes filling a first volume of the polymer melt into the cavities of the rotor at a first pressure and filling a second volume of the polymer melt into the rotor at one or more second pressures, the one or more second pressures being less than the first pressure and above an ambient pressure.

The utility model relates to a profiled fiber, and relates to the technical field of fibers. The profiled fiber comprises a flat sheet type fiber, and the profiled fiber is prepared from a high polymer melt with high viscosity. According to the profiled fiber, the cross section shape of the fiber is changed, and the specific surface area of the fiber is greatly increased, so that the profiled fiber has a relatively strong cool feeling effect.

The invention relates to a polypropylene hydrophilic modification method, an obtained material and a container cover prepared from the material. The hydrophilic modification method of the polypropylene comprises the following steps: uniformly mixing the components of the raw materials; adding the mixture into a double-screw extruder for melt grafting; and cooling the polymer melt extruded by the twin-screw extruder with water to obtain solid polymer strips, drying the polymer strips, and granulating to obtain hydrophilic polypropylene particles, namely the hydrophilic polypropylene composite material. The high-performance hydrophilic polypropylene composite material disclosed by the invention has excellent mechanical properties, the hydrophilic performance is also greatly improved, and the preparation process is simple. According to the container cover made of the material, the problems that water drops adhere to the container cover due to water vapor condensation and water drops scatter when the container cover is opened can be solved, the water drop phenomenon is improved into the water film phenomenon, the water drops scatter when the container cover is opened is avoided, the volatilization speed of water on the surface of the container cover is increased, and therefore the use dryness is enhanced, and the use experience of a user is improved.

The invention provides a plastic mold intelligent optimization system and method based on digital twinning. The method comprises the steps that a digital twinning model integrating mold cavity geometry and an injection molding machine hydraulic device is established; time sequence data of cavity pressure and screw movement in the filling and pressure maintaining stage are used as input, and PVT characteristic parameters and melt leading edge viscosity attenuation coefficients of the polymer melt in the current production period are identified and updated on line; on the basis of the PVT characteristic parameters and the melt front edge viscosity attenuation coefficient, predicting and generating a dwell pressure curve required for achieving a predefined cavity pressure balance curve in the next period; in the pressure maintaining stage of the next production cycle, the amplitude of the pressure maintaining pressure curve is adjusted according to the dynamic deviation of the cavity pressure detected in real time and the cavity pressure balance curve, a compensation control signal is output to an injection molding machine executing mechanism, and self-adaptive closed-loop adjustment of the cavity pressure is achieved. Based on the above scheme, feedforward optimization based on material characteristics and feedback control of AI disturbance can be realized.

The present invention relates to the technical field of foaming materials. Disclosed are a TPU supercritical foaming material and method for fabricating midsoles in footwear. According to the key points of the technical solution, the foaming material comprises the following raw materials in parts by weight: (1) 40-80 parts of polyol; (2) 20-50 parts of isocyanate; (3) 4-12 parts of a chain extender; (4) 0.1-30 parts of a modifier; and (5) a supercritical gas. The method for fabricating footwear midsoles from said raw materials comprises the following steps: S1, mixing, in the described parts by weight, the polyol, the isocyanate, and the chain extender, and compounding the resulting mixture in a twin-screw extruder to obtain a polymer melt; S2, preparing a supercritical gas by means of a gas inlet system, and then injecting the supercritical gas and the polymer melt into a single-screw extruder to prepare a molten mixture containing the supercritical gas; and S3, injecting the molten mixture into a mold, leaving it to stand, and then opening the mold to obtain the product.

A hot runner injection nozzle system for use in co-injection molding with a built-in obturator valve (7) in a nozzle tip assembly (16) attached to a nozzle body (1) and permits several different directions of gating. It allows for independent flow of each melt stream having their confluence at the very last possible position avoiding mutual contamination with the built-in obturator (7). The nozzle tip assembly comprises several channels providing for the flow of multiple polymeric melt streams and an obturator that serves as a check valve. Selective flow of each stream is fully controlled by individual injection units at the source providing the feed for each melt stream. The invention allows for simple fabrication, maintenance, reduces mutual contamination and allows for a more compact hot runner manifold and tool design. It allows for an optional needle-valve when the product requires a better injection point finish.

The invention provides a polylactic acid composite material and a preparation method thereof. The polylactic acid composite material is prepared from the following components in parts by weight: 70 to 90 parts of polylactic acid, 10 to 30 parts of elastomer, 5 to 6 parts of gas-phase nano filler and 0.1 to 0.5 part of antioxidant, wherein the specific surface area of the gas-phase nano filler is 200-380m < 2 > / g, and the number of surface hydroxyl groups is 2.02-3.37 / nm < 2 >. According to the invention, the gas-phase nanofiller with a specific specific surface area range and a specific number of hydroxyl groups is selected, and the characteristic that the gas-phase nanofiller spontaneously aggregates in a polymer melt to form a network is utilized to drive elastomer droplets to agglomerate in a polylactic acid matrix to form a special'bicontinuous-like structure '; the toughness is greatly improved while the rigidity of the composite material is ensured, so that the rigidity-toughness balance of the composite material is realized.

The invention relates to the technical field of non-woven material manufacturing equipment, in particular to a negative pressure drafting melt-blowing spinning device which comprises a box body, a screen, a melt heating mechanism, a receiving mechanism and a negative pressure mechanism. A micro-channel and a negative pressure channel are formed in the box body; the screen is used for receiving and transferring the molten polymer; the melt heating mechanism is arranged towards the screen; the receiving mechanism is used for receiving fibers; and a negative pressure channel is communicated with the box body, a negative pressure environment is provided for the interior of the box body, and the molten polymer is drafted through the micro-channel. A negative pressure environment is formed in the box body through the negative pressure mechanism, local negative pressure is provided below the screen through the slits formed in the inner sides of the micro-channels, and under the gravity and negative pressure conditions, drafting of molten polymers is achieved, and melt is drafted through the negative pressure, so that the recoil effect of the screen on positive pressure airflow in the prior art is reduced, and the drafting effect is improved. Meanwhile, negative pressure can be used as main drafting force, and stable and continuous preparation of the micro-nano fibers is achieved.

This invention discloses an extrusion device for outer protective tubes of buried cables, relating to the field of cable outer protective tube production technology, aiming to solve the problem of easy delamination in traditional double-layer co-extrusion structures. The key technical points are: for producing cable outer protective tubes with reinforced structures, the device includes a first extruder, a second extruder, and a forming die head; the forming die head is located at the discharge port of the first and second extruders. The first extruder provides a first polymer melt to form the tube matrix, and the second extruder forms a second polymer melt with reinforcing material. This invention, through the cooperation of a rotating mandrel and a tangential injection hole, allows the reinforcing melt to dynamically embed into the inner wall of the matrix in a helical trajectory, forming a continuous helical reinforcing rib structure. This structure significantly improves ring stiffness and resistance to external pressure without significantly increasing wall thickness and weight, and because of the one-piece molding, it solves the problem of easy delamination in traditional double-layer co-extrusion structures.

Process and apparatus for processing of polycondensates, in particular for recycling processing of contaminated polycondensates, comprising the following processing steps: a) initially charging the polycondensates / materials to be processed, in particular in a container, b) at least partially, especially completely, melting the polycondensates, in particular by extruding in an extruder, and preparing a polymer melt, c) mixing the polymer melt, d) cooling the polymer melt, e) treating the mixed and cooled polymer melt in a melt reactor, in particular for polycondensation / postcondensation, to increase the intrinsic viscosity and / or to purify the polymer melt.

A method of producing a linear fibrous structure in an alternating electric field by spinning of a polymer solution or polymer melt on a spinning electrode, in which nanofibers are formed from the polymer solution or melt in a spinning area created on the spinning electrode and are carried away from it by the action of the electric wind. In the spinning area, a narrow flat linear structure of polymer solution is formed with a finite length. The spinning area is open in the spinning direction and in the central part thereof. The nanofibers are formed and move away from the spinning area in a flat structure in which they gradually lose their kinetic energy. In a place with zero kinetic energy, nanofibers form a linear virtual collector in which nanofibers are formed into a ribbon of nanofibers.

The invention relates to the technical field of hygienic products, in particular to an air-laid glue-free core body for solidifying fluff pulp and SAP (Super Absorbent Polymer) by using superfine melt-blown fibers. The preparation method comprises the following steps: forming fluff pulp fibers into a base material layer through air laying; applying the modified SAP material to the substrate layer; the polymer melt forms melt-blown fibers through a melt-blowing process, and the melt-blown fibers directly deposit and penetrate into the SAP-containing base material layer when the melt-blown fibers have thermal viscosity to form a three-dimensional intertwining structure; and finally, carrying out hot pressing treatment on the structure, and realizing integral solidification under the condition of no additional adhesive by utilizing the thermal viscosity of the melt-blown fibers. The modified SAP material is obtained through pretreatment of an epoxy compound and coating treatment of mixed slurry of nanocrystalline cellulose and a functional additive. The problems that SAP particles in a traditional core body are prone to migration, powder falling and gel blocking are effectively solved through the glue-free solidification technology, and the obtained core body is high in absorption speed, low in back seepage amount, stable in structure and suitable for sanitary products such as paper diapers and sanitary napkins.

This invention relates to the field of polymer foaming materials technology, and discloses a plant fiber composite nucleating agent for microfoaming of biodegradable materials and its application. The plant fiber composite nucleating agent is made from raw materials comprising the following parts by weight: 80-95 parts of primary ultrafine plant fiber powder, 5-20 parts of surface modifier, and 0.1-5 parts of dispersing lubricating wax; the surface modifier and dispersing lubricating wax are coated on the surface of the primary ultrafine plant fiber powder. The application steps are as follows: adding the plant fiber composite nucleating agent to a biodegradable material matrix to obtain a pre-foaming blend, introducing foaming gas or adding a chemical foaming agent for foaming treatment. The nucleating agent of this invention improves the compatibility between plant fibers and hydrophobic biodegradable matrices, provides heterogeneous nucleation sites in the matrix while increasing the polymer melt strength, inhibits cell coalescence and rupture, and obtains microfoamed materials with uniform pore size. Furthermore, the nucleating agent itself is completely biodegradable.

The application discloses a kind of continuous fiber's ratchet roller filament spreading-press roller impregnation device, it successively includes carbon fiber yarn roll for winding fiber;Ratchet roller filament spreading-press roller impregnation device, including shell, upper portion in shell is for molten polymer melt pool, lower portion is for impregnating fiber impregnation pool, shell is set with respectively silk inlet, silk outlet relative to the two sides of impregnation pool, impregnation pool is equipped with for the ratchet roller filament spreading assembly of fiber and is used for the press roller impregnation component of fiber and is impregnated;For cooling fiber water cooling pool;For collecting fiber winding roller.The application increases the contact area of continuous fiber tows and polymer melt, can make melt more easily combined with continuous fiber in short time, reduces fiber impregnation porosity, guarantees the impregnation of forming fiber prepreg sufficient uniform, solves the problem that fiber prepreg impregnation time is short, impregnation is not sufficient, and the porosity of prepreg is high.

Rheometry systems for use with systems including pressurized polymer melt and / or other viscous materials are described. In one embodiment, a rheometer is connected to an associated system having a bent, curved, or bendable tube to allow the rheometer to measure rheological properties at a location that would otherwise be inaccessible to position the rheometer there due to the presence of an obstruction. Embodiments including rigid straight tubes for connecting the rheometer to the associated system are also described. In another embodiment, a flow-through rheometer is connected to an industry standard 1 / 2-20 thermowell orifice, which is commonly used to attach temperature and pressure probes to vessels containing viscous materials, such as extruders or injection molding systems.

A method for forming a monolith of carbon molecular sieves includes loading a resin into an extruder; heating the resin to form a polymer melt; introducing the polymer melt into a microcapillary film die to form microcapillaries in the polymer melt; quenching the polymer melt to form a microcapillary film; generating a microcapillary film layer; laminating the layers or placing the microcapillary film layers into a mold; heating the microcapillary film layers to a temperature of 50 DEG C to 350 DEG C to form a polymer monolith; pyrolyzing the polymer monolith by heating the polymer monolith to a temperature of 500 DEG C to 1700 DEG C to form the carbon molecular sieve monolith; and activating the carbon molecular sieve monolith using one or more oxidizing agents.

The present invention relates to an olefin-based polymer satisfying requirements: (1) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 1.0 to 10.0 g / 10 min; (2) a density (d) ranging from 0.875 to 0.895 g / cc; (3) 0.5 J / g≤dH(100)≤3.0 J / g and 1.0 J / g≤dH(90)≤6.0 J / g as measured by successive self-nucleation / annealing (SSA) using a differential scanning calorimeter (DSC); (4) 15≤T(90)−T(50)≤30 and 50° C.≤T(50)≤75° C. as measured by SSA using a DSC; and (5) a melting point (Tm) of 55° C.≤Tm≤80° C. as measured using a DSC. The olefin-based polymer according to the present invention is a low-density olefin-based polymer and has a highly crystalline region introduced therein, thereby exhibiting high mechanical stiffness.

The invention discloses a method for measuring a non-Newtonian index of a polymer melt. The method comprises the following steps: inputting the polymer melt to be measured into a capillary channel; driving the polymer melt to enable the polymer melt to flow in the capillary channel; collecting the driving pressure and the driving rate of the polymer melt; a non-Newtonian index of the polymer melt is calculated based on the drive pressure and the drive rate. According to the non-Newtonian index measurement method and device of the polymer melt, the computer equipment and the storage medium, calculation can be carried out only by adopting the original driving pressure and driving rate, and the calculation process can be greatly simplified.

This invention discloses a devolatilization process for high melt flow index and high transparency lithium-based polymer solutions. The process employs falling film evaporation for initial evaporation, followed by deep devolatilization using a twin-screw extruder, with the volatile solvent being condensed and recovered. The devolatilized polymer melt is then extruded by a screw extruder, pelletized by an underwater pelletizer, and dehydrated by a centrifugal dewatering machine to obtain finished polymer granules. This method can be used for the devolatilization of high melt flow index, high transparency, and low water content lithium-based polymer solutions, and the resulting polymer volatile content is ≤0.5% (mass fraction). The granules or cobblestone-like particles are easy for downstream processing applications. This process is simple, low-cost, can be manufactured using existing mature equipment and processes, and is easy to control and industrialize.

This invention provides a continuous, dynamic, and efficient defloration method for polymer / volatile component systems based on high mass transfer interfaces. [Solution] The method includes the steps of adding a polymer solution to a single-screw dynamic defoliation apparatus, wherein the polymer solution contains a defoliated polymer and volatile small molecule substances, the volatile small molecule substances containing an organic solvent, residual monomer, water, or reaction by-products, and after the material in the defoliation section is defoliated, it is conveyed and compressed by a screw and then removed from the single-screw dynamic defoliation apparatus, or providing a side-feed extruder downstream of the defoliation section, adding a plastic additive to the defoliated polymer molten body, melting and mixing it with the defoliated polymer molten body at the end of the single-screw dynamic defoliation apparatus, and then removing it from the dynamic defoliation apparatus.

The invention relates to the technical field of industrial automation and process control, and discloses an anesthesia closed type sputum suction tube body extrusion shaping Internet of Things control system, which comprises a melt state online sensing module, a high polymer melt state online sensing module, a high polymer melt state online sensing module, a high polymer melt state online sensing module and a high polymer melt state online sensing module, and the high polymer melt state online sensing module is used for acquiring rheological state information of high polymer melt in real time to provide basis for control decision; the cooperative control execution module is used for executing feed-forward control based on the melt state information so as to instantaneously suppress the roughness of the inner wall of the pipe body, performing decoupling compensation control so as to eliminate the disturbance to the size of the pipe body, and combining size feedback correction to finally synthesize a cooperative control instruction for driving a plurality of actuators; and the Internet of Things monitoring and management platform communicates with the cooperative control execution module and is used for intensively receiving and storing high-frequency control data and process parameters in the production process so as to realize remote monitoring and quality tracing. According to the invention, through cooperative control of melt sensing, feedforward and decoupling, the roughness of the inner wall is instantaneously inhibited, the outer diameter is stabilized, and self-optimization is realized through the Internet of Things.

The invention relates to a method for purifying a thermoplastic material (22), such as polyethylene terephthalate (PET), comprising the steps of: - supplying pellets or shreds of the thermoplastic material into a melt processing device (20); and - melting the thermoplastic material to form a polymer melt; wherein the method further comprises a step of: - adding a pro-degradant into the pellets or shreds of the thermoplastic material, and / or into the polymer melt, to selectively degrade at least polyvinyl chloride (PVC) and benzene impurities, and / or any intermediate degradation product formed by or leading to the formation of such impurities, contained within said thermoplastic material and / or said polymer melt.

The present invention relates to a polyethylene composition comprising polyethylene having excellent balance between processability and mechanical property. Said polyethylene composition has significantly improved polymer melt strength and also shows good shear sensitivity behavior while also providing improved mechanical property. These are the results of the polymer which is characterized in the molecular weight distribution and the short chain branching distribution, as shown in this present invention, due to synergistic behavior of the dual catalyst system in which said polyethylene can be prepared using single polymerization reactor.

The invention discloses a preparation method of a high-flexibility nylon ester film. The preparation method comprises the following steps: S1, preparing a nylon oligomer; s2, preparing a PTMEG (polytetramethylene ether glycol) prepolymer; s3, mixing the nylon oligomer in the step S1 and the PTMEG prepolymer in the step S2 with a cross-linking agent and a catalyst, and stirring to enable the mixture to react to form a homogeneous polymer melt; and S4, casting the polymer melt into a film through a casting machine, and cooling to obtain the nylon ester film after stretching, sizing and annealing treatment. The invention also discloses a nylon ester film. According to the invention, the PA1010 oligomer is subjected to grafting reaction with the isocyanate group of the PTMEG prepolymer and the cross-linking agent through the active end group, so that a nylon ester block structure is really formed, a firm covalent bond is formed, and the problem of interfacial compatibility is fundamentally solved. Meanwhile, a three-dimensional network structure is formed through the cross-linking agent, the molecular-level combination effect of soft-hard segments is achieved, and therefore the defect that the hard segments and the soft segments are separated on the macroscopic or microcosmic scale is overcome.

The present invention discloses a method for producing a hybrid component (1) which comprises at least one plastics layer (2) and at least one protection element (4, 7) which is connected to the plastics layer (2), wherein the method comprises the following method steps: - providing a pressing tool (10) which comprises a lower tool part (20) and an upper tool part (30), wherein the upper tool part (30) and the lower tool part (20) are movable relative to one another along a movement direction (R) between an open position and a closed position of the pressing tool (10); - placing at least one protection element (4, 7) and at least one polymer melt (P) into the pressing tool, which is in the open position, in such a way that the polymer melt (P) and the protection element (4, 7) are arranged above one another along the movement direction (R); and - closing the pressing tool (10), with the result that the upper tool part (30) comes into contact at least indirectly with the at least one polymer melt (P) or with the at least one protection element (4, 7), and the polymer melt (P) is reshaped by way of application of pressure by means of the upper tool part (30) and / or by means of the lower tool part (20), and the at least one polymer melt (P) is connected to the at least one protection element (4, 7) with the formation of the plastics layer (2). Furthermore, the present invention discloses a pressing tool (10) for producing a hybrid component (1) which comprises at least one plastics layer (2) and at least one protection element (4, 7) which is connected to the plastics layer (2).